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-8=3k+k
We move all terms to the left:
-8-(3k+k)=0
We add all the numbers together, and all the variables
-(+4k)-8=0
We get rid of parentheses
-4k-8=0
We move all terms containing k to the left, all other terms to the right
-4k=8
k=8/-4
k=-2
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